// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "ui/views/window/dialog_delegate.h"

#include <utility>
#include <variant>

#include "base/debug/alias.h"
#include "base/feature_list.h"
#include "base/logging.h"
#include "base/metrics/histogram_macros.h"
#include "base/observer_list.h"
#include "build/build_config.h"
#include "ui/accessibility/ax_enums.mojom.h"
#include "ui/accessibility/ax_node_data.h"
#include "ui/accessibility/ax_role_properties.h"
#include "ui/base/l10n/l10n_util.h"
#include "ui/base/metadata/metadata_impl_macros.h"
#include "ui/base/mojom/dialog_button.mojom.h"
#include "ui/base/mojom/ui_base_types.mojom-shared.h"
#include "ui/base/ui_base_types.h"
#include "ui/gfx/color_palette.h"
#include "ui/gfx/geometry/rounded_corners_f.h"
#include "ui/strings/grit/ui_strings.h"
#include "ui/views/bubble/bubble_border.h"
#include "ui/views/bubble/bubble_dialog_delegate_view.h"
#include "ui/views/bubble/bubble_frame_view.h"
#include "ui/views/buildflags.h"
#include "ui/views/layout/layout_provider.h"
#include "ui/views/style/platform_style.h"
#include "ui/views/view_utils.h"
#include "ui/views/views_features.h"
#include "ui/views/widget/widget.h"
#include "ui/views/widget/widget_observer.h"
#include "ui/views/window/dialog_client_view.h"
#include "ui/views/window/dialog_observer.h"

namespace views {

namespace {

// Class that ensures that dialogs are logically "parented" to their parent for
// various purposes, including testing, theming, and Tutorials.
class DialogWidget : public Widget {
 public:
  DialogWidget() = default;
  ~DialogWidget() override = default;

  // Widget:
  Widget* GetPrimaryWindowWidget() override {
    // Dialogs are usually parented to another window, so that window should be
    // the primary window. Only fall back to default Widget behavior if there is
    // no parent.
    return parent() ? parent()->GetPrimaryWindowWidget()
                    : Widget::GetPrimaryWindowWidget();
  }

  // TODO(dfried): Possibly also fix the following (possibly in Widget) so they
  // don't have to be overridden in bubble_dialog_delegate_view.cc:
  //  - GetCustomTheme()
  //  - GetNativeTheme()
  //  - GetColorProvider()
};

bool HasCallback(
    const std::variant<base::OnceClosure, base::RepeatingCallback<bool()>>&
        callback) {
  return std::visit(
      [](const auto& variant) { return static_cast<bool>(variant); }, callback);
}

}  // namespace

////////////////////////////////////////////////////////////////////////////////
// DialogDelegate::Params:
DialogDelegate::Params::Params() = default;
DialogDelegate::Params::~Params() = default;

////////////////////////////////////////////////////////////////////////////////
// DialogDelegate:

DialogDelegate::DialogDelegate() {
  RegisterWindowWillCloseCallback(
      RegisterWillCloseCallbackPassKey(),
      base::BindOnce(&DialogDelegate::WindowWillClose, base::Unretained(this)));
}

// static
Widget* DialogDelegate::CreateDialogWidget(WidgetDelegate* delegate,
                                           gfx::NativeWindow context,
                                           gfx::NativeView parent) {
  views::Widget* widget = new DialogWidget;
  views::Widget::InitParams params =
      GetDialogWidgetInitParams(delegate, context, parent, gfx::Rect());
  widget->Init(std::move(params));
  return widget;
}

// static
Widget* DialogDelegate::CreateDialogWidget(
    std::unique_ptr<WidgetDelegate> delegate,
    gfx::NativeWindow context,
    gfx::NativeView parent) {
  return CreateDialogWidget(delegate.release(), context, parent);
}

// static
bool DialogDelegate::CanSupportCustomFrame(gfx::NativeView parent) {
#if BUILDFLAG(IS_LINUX) && BUILDFLAG(ENABLE_DESKTOP_AURA)
  // The new style doesn't support unparented dialogs on Linux desktop.
  return parent != nullptr;
#else
  return true;
#endif
}

// static
Widget::InitParams DialogDelegate::GetDialogWidgetInitParams(
    WidgetDelegate* delegate,
    gfx::NativeWindow context,
    gfx::NativeView parent,
    const gfx::Rect& bounds) {
  DialogDelegate* dialog = delegate->AsDialogDelegate();

  views::Widget::InitParams params(
      dialog ? dialog->ownership_of_new_widget_
             : Widget::InitParams::NATIVE_WIDGET_OWNS_WIDGET);
  params.delegate = delegate;
  params.bounds = bounds;

  if (dialog) {
    dialog->params_.custom_frame &= CanSupportCustomFrame(parent);
  }

  if (!dialog || dialog->use_custom_frame()) {
    params.opacity = Widget::InitParams::WindowOpacity::kTranslucent;
    params.remove_standard_frame = true;
#if !BUILDFLAG(IS_MAC)
    // Except on Mac, the bubble frame includes its own shadow; remove any
    // native shadowing. On Mac, the window server provides the shadow.
    params.shadow_type = views::Widget::InitParams::ShadowType::kNone;
#endif
  }
  params.context = context;
  params.parent = parent;
#if !BUILDFLAG(IS_APPLE)
  // Web-modal (ui::mojom::ModalType::kChild) dialogs with parents are marked as
  // child widgets to prevent top-level window behavior (independent movement,
  // etc). However, on Mac or when forcing to use desktop widget, the
  // dialog must be considered top-level to gain focus and input method
  // behaviors.
  // TODO(crbug.com/346974105): This might be wrong because it implies multiple
  // focus managers in a widget tree. A widget tree should have a single focus
  // manager, so that it is impossible for two widgets to have focus
  // simultaneously.
  params.child = parent &&
                 (delegate->GetModalType() == ui::mojom::ModalType::kChild) &&
                 !delegate->use_desktop_widget_override();
#endif

  if (BubbleDialogDelegate* bubble = delegate->AsBubbleDialogDelegate()) {
    // TODO(crbug.com/41493925): Remove this CHECK once native frame dialogs
    // support autosize.
    CHECK(!bubble->is_autosized() || bubble->use_custom_frame())
        << "Autosizing native frame dialogs is not supported.";
    params.autosize = bubble->is_autosized();
  }

  return params;
}

int DialogDelegate::GetDefaultDialogButton() const {
  if (GetParams().default_button.has_value()) {
    return *GetParams().default_button;
  }
  if (buttons() & static_cast<int>(ui::mojom::DialogButton::kOk)) {
    return static_cast<int>(ui::mojom::DialogButton::kOk);
  }
  if (buttons() & static_cast<int>(ui::mojom::DialogButton::kCancel)) {
    return static_cast<int>(ui::mojom::DialogButton::kCancel);
  }
  return static_cast<int>(ui::mojom::DialogButton::kNone);
}

std::u16string DialogDelegate::GetDialogButtonLabel(
    ui::mojom::DialogButton button) const {
  if (!GetParams().button_labels[static_cast<size_t>(button)].empty()) {
    return GetParams().button_labels[static_cast<size_t>(button)];
  }

  if (button == ui::mojom::DialogButton::kOk) {
    return l10n_util::GetStringUTF16(IDS_APP_OK);
  }
  CHECK_EQ(button, ui::mojom::DialogButton::kCancel);
  return buttons() & static_cast<int>(ui::mojom::DialogButton::kOk)
             ? l10n_util::GetStringUTF16(IDS_APP_CANCEL)
             : l10n_util::GetStringUTF16(IDS_APP_CLOSE);
}

ui::ButtonStyle DialogDelegate::GetDialogButtonStyle(
    ui::mojom::DialogButton button) const {
  std::optional<ui::ButtonStyle> style =
      GetParams().button_styles[static_cast<size_t>(button)];
  if (style.has_value()) {
    return *style;
  }

  return GetIsDefault(button) ? ui::ButtonStyle::kProminent
                              : ui::ButtonStyle::kTonal;
}

bool DialogDelegate::GetIsDefault(ui::mojom::DialogButton button) const {
  return GetDefaultDialogButton() == static_cast<int>(button) &&
         (button != ui::mojom::DialogButton::kCancel ||
          PlatformStyle::kDialogDefaultButtonCanBeCancel);
}

bool DialogDelegate::IsDialogButtonEnabled(
    ui::mojom::DialogButton button) const {
  return params_.enabled_buttons & static_cast<int>(button);
}

bool DialogDelegate::ShouldIgnoreButtonPressedEventHandling(
    View* button,
    const ui::Event& event) const {
  return false;
}

bool DialogDelegate::Cancel() {
  DCHECK(!already_started_close_);
  if (HasCallback(cancel_callback_)) {
    return RunCloseCallback(cancel_callback_);
  }
  return true;
}

bool DialogDelegate::Accept() {
  DCHECK(!already_started_close_);
  if (HasCallback(accept_callback_)) {
    return RunCloseCallback(accept_callback_);
  }
  return true;
}

bool DialogDelegate::RunCloseCallback(
    std::variant<base::OnceClosure, base::RepeatingCallback<bool()>>&
        callback) {
  DCHECK(!already_started_close_);
  if (std::holds_alternative<base::OnceClosure>(callback)) {
    already_started_close_ = true;
    std::get<base::OnceClosure>(std::move(callback)).Run();
    return true;
  } else {
    base::WeakPtr<Widget> weak_ptr = GetWidget()->GetWeakPtr();
    bool already_started_close =
        std::get<base::RepeatingCallback<bool()>>(callback).Run();
    // Widget may get destroyed after the callback is run, this will detect
    // that condition.
    if (!weak_ptr) {
      return false;
    }
    already_started_close_ = already_started_close;
    return already_started_close_;
  }

  NOTREACHED();
}

View* DialogDelegate::GetInitiallyFocusedView() {
  if (WidgetDelegate::HasConfiguredInitiallyFocusedView()) {
    return WidgetDelegate::GetInitiallyFocusedView();
  }

  // Focus the default button if any.
  const DialogClientView* dcv = GetDialogClientView();
  if (!dcv) {
    return nullptr;
  }
  int default_button = GetDefaultDialogButton();
  if (default_button == static_cast<int>(ui::mojom::DialogButton::kNone)) {
    return nullptr;
  }

  // The default button should be a button we have.
  CHECK(default_button & buttons());

  if (default_button & static_cast<int>(ui::mojom::DialogButton::kOk)) {
    return dcv->ok_button();
  }
  if (default_button & static_cast<int>(ui::mojom::DialogButton::kCancel)) {
    return dcv->cancel_button();
  }
  return nullptr;
}

DialogDelegate* DialogDelegate::AsDialogDelegate() {
  return this;
}

ClientView* DialogDelegate::CreateClientView(Widget* widget) {
  return new DialogClientView(widget, TransferOwnershipOfContentsView());
}

std::unique_ptr<NonClientFrameView> DialogDelegate::CreateNonClientFrameView(
    Widget* widget) {
  return use_custom_frame() ? CreateDialogFrameView(widget)
                            : WidgetDelegate::CreateNonClientFrameView(widget);
}

void DialogDelegate::WindowWillClose() {
  if (already_started_close_) {
    return;
  }

  const bool new_callback_present = close_callback_ ||
                                    HasCallback(cancel_callback_) ||
                                    HasCallback(accept_callback_);

  if (close_callback_) {
    // `RunCloseCallback` takes a non-const reference to this variant to support
    // the accept and cancel callbacks. It doesn't make sense to be storing a
    // variant for close callbacks, so we construct the variant here instead.
    std::variant<base::OnceClosure, base::RepeatingCallback<bool()>>
        close_callback_wrapped(std::move(close_callback_));
    RunCloseCallback(close_callback_wrapped);
  }

  if (new_callback_present) {
    return;
  }

  // This is set here instead of before the invocations of Accept()/Cancel() so
  // that those methods can DCHECK that !already_started_close_. Otherwise,
  // client code could (eg) call Accept() from inside the cancel callback, which
  // could lead to multiple callbacks being delivered from this class.
  already_started_close_ = true;
}

bool DialogDelegate::EscShouldCancelDialog() const {
  // Use cancel as the Esc action if there's no defined "close" action. If the
  // delegate has either specified a closing action or a close-x they can expect
  // it to be called on Esc.
  return esc_should_cancel_dialog_override_.value_or(!close_callback_ &&
                                                     !ShouldShowCloseButton());
}

// static
std::unique_ptr<NonClientFrameView> DialogDelegate::CreateDialogFrameView(
    Widget* widget) {
  LayoutProvider* provider = LayoutProvider::Get();
  auto frame = std::make_unique<BubbleFrameView>(
      provider->GetInsetsMetric(INSETS_DIALOG_TITLE), gfx::Insets());

  const BubbleBorder::Shadow kShadow = BubbleBorder::DIALOG_SHADOW;
  std::unique_ptr<BubbleBorder> border =
      std::make_unique<BubbleBorder>(BubbleBorder::FLOAT, kShadow);
  DialogDelegate* delegate = widget->widget_delegate()->AsDialogDelegate();
  if (delegate) {
    if (delegate->GetParams().round_corners) {
      border->set_rounded_corners(
          gfx::RoundedCornersF(delegate->GetCornerRadius()));
    }
    frame->SetFootnoteView(delegate->DisownFootnoteView());
  }
  frame->SetBubbleBorder(std::move(border));
  return frame;
}

const DialogClientView* DialogDelegate::GetDialogClientView() const {
  if (!GetWidget()) {
    return nullptr;
  }
  return AsViewClass<DialogClientView>(GetWidget()->client_view());
}

DialogClientView* DialogDelegate::GetDialogClientView() {
  return const_cast<DialogClientView*>(
      const_cast<const DialogDelegate*>(this)->GetDialogClientView());
}

BubbleFrameView* DialogDelegate::GetBubbleFrameView() const {
  if (!use_custom_frame()) {
    return nullptr;
  }

  const NonClientView* view =
      GetWidget() ? GetWidget()->non_client_view() : nullptr;
  return view ? static_cast<BubbleFrameView*>(view->frame_view()) : nullptr;
}

views::MdTextButton* DialogDelegate::GetOkButton() const {
  DCHECK(GetWidget()) << "Don't call this before OnWidgetInitialized";
  auto* client = GetDialogClientView();
  return client ? client->ok_button() : nullptr;
}

views::MdTextButton* DialogDelegate::GetCancelButton() const {
  DCHECK(GetWidget()) << "Don't call this before OnWidgetInitialized";
  auto* client = GetDialogClientView();
  return client ? client->cancel_button() : nullptr;
}

views::View* DialogDelegate::GetExtraView() const {
  DCHECK(GetWidget()) << "Don't call this before OnWidgetInitialized";
  auto* client = GetDialogClientView();
  return client ? client->extra_view() : nullptr;
}

views::View* DialogDelegate::GetFootnoteViewForTesting() const {
  if (!GetWidget()) {
    return footnote_view_.get();
  }

  NonClientFrameView* frame = GetWidget()->non_client_view()->frame_view();

  // CreateDialogFrameView above always uses BubbleFrameView. There are
  // subclasses that override CreateDialogFrameView, but none of them override
  // it to create anything other than a BubbleFrameView.
  // TODO(crbug.com/40101916): Make CreateDialogFrameView final, then
  // remove this DCHECK.
  DCHECK(IsViewClass<BubbleFrameView>(frame));
  return static_cast<BubbleFrameView*>(frame)->GetFootnoteView();
}

void DialogDelegate::AddObserver(DialogObserver* observer) {
  observer_list_.AddObserver(observer);
}

void DialogDelegate::RemoveObserver(DialogObserver* observer) {
  observer_list_.RemoveObserver(observer);
}

void DialogDelegate::DialogModelChanged() {
  observer_list_.Notify(&DialogObserver::OnDialogChanged);
}

void DialogDelegate::TriggerInputProtection(bool force_early) {
  GetDialogClientView()->TriggerInputProtection(force_early);
}

void DialogDelegate::SetDefaultButton(int button) {
  if (params_.default_button == button) {
    return;
  }
  params_.default_button = button;
  DialogModelChanged();
}

void DialogDelegate::SetButtons(int buttons) {
  if (params_.buttons == buttons) {
    return;
  }
  params_.buttons = buttons;
  DialogModelChanged();
}

void DialogDelegate::SetButtonEnabled(ui::mojom::DialogButton dialog_button,
                                      bool enabled) {
  int button = static_cast<int>(dialog_button);
  if (!!(params_.enabled_buttons & button) == enabled) {
    return;
  }
  if (enabled) {
    params_.enabled_buttons |= button;
  } else {
    params_.enabled_buttons &= ~button;
  }
  DialogModelChanged();
}

void DialogDelegate::SetButtonLabel(ui::mojom::DialogButton button,
                                    std::u16string_view label) {
  if (params_.button_labels[static_cast<size_t>(button)] == label) {
    return;
  }
  params_.button_labels[static_cast<size_t>(button)] = std::u16string(label);
  DialogModelChanged();
}

void DialogDelegate::SetButtonStyle(ui::mojom::DialogButton button,
                                    std::optional<ui::ButtonStyle> style) {
  if (params_.button_styles[static_cast<size_t>(button)] == style) {
    return;
  }
  params_.button_styles[static_cast<size_t>(button)] = style;
  DialogModelChanged();
}

void DialogDelegate::SetAcceptCallback(base::OnceClosure callback) {
  accept_callback_ = std::move(callback);
}

void DialogDelegate::SetAcceptCallbackWithClose(
    base::RepeatingCallback<bool()> callback) {
  accept_callback_ = std::move(callback);
}

void DialogDelegate::SetCancelCallback(base::OnceClosure callback) {
  cancel_callback_ = std::move(callback);
}

void DialogDelegate::SetCancelCallbackWithClose(
    base::RepeatingCallback<bool()> callback) {
  cancel_callback_ = std::move(callback);
}

void DialogDelegate::SetCloseCallback(base::OnceClosure callback) {
  close_callback_ = std::move(callback);
}

void DialogDelegate::SetOwnershipOfNewWidget(
    Widget::InitParams::Ownership ownership) {
  CHECK(!GetWidget());
  ownership_of_new_widget_ = ownership;
}

std::optional<std::unique_ptr<View>> DialogDelegate::DisownExtraView() {
  return std::exchange(extra_view_, std::nullopt);
}

bool DialogDelegate::Close() {
  WindowWillClose();
  return true;
}

void DialogDelegate::ResetViewShownTimeStampForTesting() {
  GetDialogClientView()->ResetViewShownTimeStampForTesting();
}

void DialogDelegate::SetButtonRowInsets(const gfx::Insets& insets) {
  GetDialogClientView()->SetButtonRowInsets(insets);
}

void DialogDelegate::AcceptDialog() {
  // Copy the dialog widget name onto the stack so it appears in crash dumps.
  DEBUG_ALIAS_FOR_CSTR(last_widget_name, GetWidget()->GetName().c_str(), 64);

  DCHECK(IsDialogButtonEnabled(ui::mojom::DialogButton::kOk));

  // Widget (and maybe this delegate) may get destroyed from the Accept() call
  // below. This will detect that condition.
  auto weak_widget_ptr = GetWidget()->GetWeakPtr();

  if (already_started_close_ || !Accept()) {
    return;
  }

  // `this` may also have been destroyed as a result of the call to Accept().
  // Checking whether the widget was destroyed is sufficient for either case. If
  // only the Widget is destroyed, performing the following actions is
  // irrelevant (and dangerous). If the widget and this delegate are destroyed
  // together, then we still need to avoid the following actions.
  if (!weak_widget_ptr) {
    return;
  }
  already_started_close_ = true;
  weak_widget_ptr->CloseWithReason(
      views::Widget::ClosedReason::kAcceptButtonClicked);
}

void DialogDelegate::CancelDialog() {
  // If there's a close button available, this callback should only be reachable
  // if the cancel button is available. Otherwise this can be reached through
  // closing the dialog via Esc.
  if (ShouldShowCloseButton()) {
    DCHECK(IsDialogButtonEnabled(ui::mojom::DialogButton::kCancel));
  }

  // Widget (and maybe this delegate) may get destroyed from the Cancel() call
  // below. This will detect that condition.
  auto weak_widget_ptr = GetWidget()->GetWeakPtr();

  if (already_started_close_ || !Cancel()) {
    return;
  }

  // See the comment above in AcceptDialog().
  if (!weak_widget_ptr) {
    return;
  }
  already_started_close_ = true;
  weak_widget_ptr->CloseWithReason(
      views::Widget::ClosedReason::kCancelButtonClicked);
}

DialogDelegate::~DialogDelegate() = default;

ax::mojom::Role DialogDelegate::GetAccessibleWindowRole() {
  return ax::mojom::Role::kDialog;
}

int DialogDelegate::GetCornerRadius() const {
  if (!Widget::IsWindowCompositingSupported()) {
    return 0;
  }
#if BUILDFLAG(IS_MAC)
  // TODO(crbug.com/40144839): On Mac MODAL_TYPE_WINDOW is implemented using
  // sheets which causes visual artifacts when corner radius is increased for
  // modal types. Remove this after this issue has been addressed.
  if (GetModalType() == ui::mojom::ModalType::kWindow) {
    return 2;
  }
#endif
  if (params_.corner_radius) {
    return *params_.corner_radius;
  }
  return LayoutProvider::Get()->GetCornerRadiusMetric(
      views::ShapeContextTokens::kDialogRadius);
}

std::unique_ptr<View> DialogDelegate::DisownFootnoteView() {
  return std::move(footnote_view_);
}

////////////////////////////////////////////////////////////////////////////////
// DialogDelegateView:

DialogDelegateView::~DialogDelegateView() = default;

Widget* DialogDelegateView::GetWidget() {
  return View::GetWidget();
}

const Widget* DialogDelegateView::GetWidget() const {
  return View::GetWidget();
}

View* DialogDelegateView::GetContentsView() {
  return this;
}

DialogDelegateView::DialogDelegateView() = default;

BEGIN_METADATA(DialogDelegateView)
END_METADATA

}  // namespace views